Readthe following passage carefully and choose the correct answer:Zack and Carry, along with otherstudents, dressed in ski suits and got on a ski lift that carried them to thetop of a slope. They practiced skiing on the gentle slopes on the first day.Over the next six days, all the students learnt to take simple turns and thenmore difficult ones. At the end of the seven days, Zack and Carry couldcomfortably ski on the snow and had a terrific time. In how many days Zack and Carry could comfortably ski?

• A. After the end of 6 days
• B. After the end of 5 days
• C. After the end of 7 days
• D. None of these